<template>
    <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
            title="添加商品的信息"
            type="info"
            show-icon
            :closable="false">
        </el-alert>

        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- 标签栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model='activeIndex' tab-position="left" :before-leave='beforeTabLeave' @tab-click='tabClicked'>
                <!-- 基本信息 -->
                <el-tab-pane label="基本信息" name='0'>
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price" type='number'>
                        <el-input v-model="addForm.goods_price"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type='number'></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type='number'></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            :props="cascaderProps"
                            @change="handleChange">
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>

                <!-- 商品参数 -->
                <el-tab-pane label="商品参数" name='1'>
                    <!-- 渲染表单item项 -->
                    <el-form-item v-for='item in manyTableData' :key='item.attr_id' :label="item.attr_name">
                         <el-checkbox-group v-model="item.attr_checked_vals">
                            <el-checkbox :label="item1" v-for="(item1,i) in item.attr_vals" :key='i' border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>

                <!-- 商品属性 -->
                <el-tab-pane label="商品属性" name='2'>
                    <el-form-item v-for="item2 in onlyTableData" :key="item2.attr_id" :label="item2.attr_name">
                        <el-input v-model="item2.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>

                <!-- 商品图片 -->
                <el-tab-pane label="商品图片" name='3'>
                    <!-- action表示图片要上传到的后台API地址 -->
                    <el-upload
                    action="http://127.0.0.1:8888/api/private/v1/upload"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj"
                    :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                        <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                    </el-upload>
                </el-tab-pane>

                <!-- 商品内容 -->
                <el-tab-pane label="商品内容" name='4'>
                    <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品的按钮 -->
                    <el-button type="primary" style="margin-top:10px" @click="add">添加商品</el-button>
                </el-tab-pane>

            </el-tabs>
        </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
    title="图片预览"
    :visible.sync="previewDialogVisible"
    width="50%"
    >
        <img :src="previewPath" alt="" style="width:100%">
    </el-dialog>
    </div>
</template>

<script>
export default {
    name:'Add',
    data(){
        return {
            // 添加商品侧边栏的索引
            activeIndex:0,
            // 级联选择框商品列表
            cateList:[],
            // 获取到的商品动态参数
            manyTableData:[],
            // 获取到的商品静态属性
            onlyTableData:[],
            // 级联选择框设置
            cascaderProps:{ expandTrigger: 'hover' ,label:'cat_name' , value:'cat_id' , children:'children'},
            // 上传图片组件的headers请求头对象
            headerObj:{
                Authorization:sessionStorage.getItem('token')
            },
            // 图片预览地址
            previewPath:'',
            // 图片预览框的显示与隐藏
            previewDialogVisible:false,
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            // 表单校验规则
            addFormRules:{
                goods_name:[{ required: true, message: '请输入商品名称', trigger: 'blur' },],
                goods_price:[{ required: true, message: '请输入商品价格', trigger: 'blur' },],
                goods_weight:[{ required: true, message: '请输入商品重量', trigger: 'blur' },],
                goods_number:[{ required: true, message: '请输入商品数量', trigger: 'blur' },],
                goods_cat:[{ required: true, message: '请输入商品数量', trigger: 'blur' },],
            }
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
    methods:{
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            // console.log(res)
            if(res.meta.status !== 200){
                this.$message.error('获取商品分类失败')
            }
            this.cateList = res.data
            // console.log(res.data)
        },

        // 监听级联对话框，只有三级分类可选中
        handleChange(){
            // console.log(this.addForm)
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },

        // 选中基本信息标签页时，只有商品分类填写了才能选择其他标签页
        beforeTabLeave(activeName,oldActiveName){
            // console.log(activeName,oldActiveName)
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },

        // 进入商品参数页面时，获取商品参数
        async tabClicked(){
            if(this.activeIndex === '1') {
                // console.log(this.addForm)
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                // console.log(res)
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数失败')
                }
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals.length !== 0 ? item.attr_vals.split(' ') : []
                    item.attr_checked_vals = [...item.attr_vals]
                })
                this.manyTableData = res.data
            }

            else if(this.activeIndex === '2'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})

                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败')
                }
                // console.log(res.data)
                this.onlyTableData = res.data
            }
        },

        // 处理图片预览效果
        handlePreview(file){
            // console.log(file)
            this.previewPath = file.response.data.url
            this.previewDialogVisible = true
        },

        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x=>{
                x.pic === filePath
            })
            // 3.将该图片对应的对象从数组中移除
            this.addForm.pics.splice(i,1)
            // console.log(this.addForm)
        },

        // 监听图片上传成功的事件
        handleSuccess(response){
            // console.log(response)
            const picInfo = {pic: response.data.tmp_path}
            this.addForm.pics.push(picInfo)
            // console.log(this.addForm.pics)
        },

        // 表单验证是否填写完整，并添加商品 
        add(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) {
                    return this.$message.error('请填写必填项')
                }
                const deepCloneAddForm = JSON.parse(JSON.stringify(this.addForm))
                deepCloneAddForm.goods_cat = deepCloneAddForm.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item =>{
                    const newInfo = {
                        "attr_id": item.attr_id,
                        "attr_value":item.attr_checked_vals.join(',')
                    }
                    deepCloneAddForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item2 =>{
                    const newInfo = {
                        "attr_id": item2.attr_id,
                        "attr_value":item2.attr_vals        
                    }
                    deepCloneAddForm.attrs.push(newInfo)
                })
                // console.log(deepCloneAddForm)
                
                // 发起请求添加商品
                // 商品的名称必须是唯一的
                const {data: res} = await this.$http.post('goods',deepCloneAddForm);
                // console.log(res)
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }
    },
    created(){
        this.getCateList()

    }
}
</script>

<style scoped>
    .el-checkbox {
        margin: 0 10px 0 0 !important;
    }
</style>